Inverse Matrices
Systems of Equations · 20 Questions
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⚡ Quick Memory Points
🔑MATRIX EQ: Write as AX = B, then solve X = A⁻¹B
🔢2×2 INVERSE: Swap a,d → Negate b,c → Divide by det
⚠️DET = 0 ? No inverse! System has no unique solution
📐ORDER MATTERS: Always A⁻¹ on LEFT of B
✅CHECK: Plug answers back into BOTH original equations
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